Wheel train centering calibration tool

The invention relates to the technical field of calibration equipment, and discloses a wheel train centering calibration tool which is characterized in that a threaded hole is formed in one end of a threaded sleeve, the threaded hole is connected with a double-threaded rod in a sleeving mode, the tool comprises a top plate, and supporting plates are fixedly installed at the positions, close to the two ends, of the bottom of the top plate; a threaded hole is formed in one end of a threaded sleeve and connected with a double-threaded rod in a sleeving mode, the rotating direction of a thread a is opposite to that of a thread b, the threaded sleeves located on the two sides of the double-threaded rod can synchronously draw close to the middle, and the limiting device is always kept in the middle of positioning devices on the two sides in the process; when the contact plate on one side is in contact with the front wheel set or the rear wheel set before the contact plate on the other side is in contact with the fr